/*
 * #%L
 * Putting Objects to Good Use
 * $Id:$
 * $HeadURL: http://java-creed-examples.googlecode.com/svn/design/Putting%20Objects%20to%20Good%20Use/src/main/java/com/javacreed/examples/oop/part3/tax/AbstractTaxCalculator.java $
 * %%
 * Copyright (C) 2012 - 2014 Java Creed
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package com.javacreed.examples.oop.part3.tax;

import java.math.BigDecimal;
import java.math.RoundingMode;

public abstract class AbstractTaxCalculator implements TaxCalculator {

  protected abstract BigDecimal calculate(BigDecimal value);

  @Override
  public BigDecimal calculateTax(final BigDecimal value) {
    final BigDecimal tax = calculate(value);
    final BigDecimal rounded = round(tax);
    return rounded;
  }

  protected BigDecimal round(BigDecimal value) {
    /* Rounded up to the nearest 0.05 */
    value = value.multiply(new BigDecimal("20")).setScale(0, RoundingMode.UP).setScale(2);
    value = value.divide(new BigDecimal("20"), RoundingMode.UP);
    return value;
  }
}
